70 percent IIRC, it’s definitely cleaner now than it used to be.
Ya. Life was tough back then. Just 100 years ago. The scary thing is that it wouldn’t take much for us to revert back to those conditions.
Heck, it was only 150 years ago that a doctor would walk from patient to patient with infected hands or they would use the same surgical instrument over and over again without cleaning it.
Or the story about the penny lick ice cream and the spread TB.